The bicycle business in this country had passed through a similar experience. When first placed on the market bicycles were expensive; it took $100 or $150 to buy one. In a few years, however, an excellent machine was selling for $25 or $30. What explained this drop in price? The answer is that the manufacturers learned to standardize their product. Bicycle factories became not so much places where the articles were manufactured as assembling rooms for putting them together. The several parts were made in different places, each establishment specializing in a particular part; they were then shipped to centers where they were transformed into completed machines. The result was that the United States, despite the high wages paid here, led the world in bicycle making and flooded all countries with this utilitarian article. Our great locomotive factories had developed on similar lines. Europeans had always marveled that Americans could build these costly articles so cheaply that they could undersell European makers. When they obtained a glimpse of an American locomotive factory, the reason became plain. In Europe each locomotive was a separate problem; no two, even in the same shop, were exactly alike. But here locomotives are built in parts, all duplicates of one another; the parts are then sent by machinery to assembling rooms and rapidly put together. American harvesting machines are built in the same way; whenever a farmer loses a part, he can go to the country store and buy its duplicate, for the parts of the same machine do not vary to the thousandth of an inch. The same principle applies to hundreds of other articles.